Dd is only 17m and used to sleep 7.30-730ish recently just isn't tired at bedtime and won't go to sleep until 830/9 and is waking at 730/8 she naps for an hour anytime between 1 and 3. Wondering if we need to drop the nap but thinking surely she's too young? The late bed times are great when I'm working but when we've been together all day it's a long evening!